linux/ion.h missing after NDK 17

[Bin Li]

I can find linux/ion.h in NDK 15 and NDK 16, but not after NDK 17. So how to use ION memory with NDK 17 or later?

[rpri...@google.com]

It looks like ion.h was removed in:

https://android-review.googlesource.com/c/platform/bionic/+/671451/

I think the concern is that ion is still in the upstream Linux kernel's staging directory (drivers/staging/android), so the API might change.

[Ryan Prichard]

There's some more information about the unstable ion ABI on this page:

https://source.android.com/devices/architecture/kernel/ion_abi_changes

[Alias R. Cummins]

Don't use it. Just compile with clang against NDK 21.

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[cfe...@google.com]

To be explicit, ion.h was removed because of the abi breakage in kernel 4.14. There is no longer a single ion.h that can be used on kernels before this and kernels after it, so it's better to remove it completely from the exported headers.

[Bin Li]

Thanks.

在 2020年2月22日星期六 UTC+8上午8:43:30，Christopher Ferris写道：

[cfe...@google.com]

By the way, what are you planning to use ion for? At some time in the future, when the ion situation has been fixed, we might want to expose some kind of public API. It will be important that we understand what users want to do with ion, so the public api will be useful.